我正在尝试使用 Angular 7 设置选择选项的默认值,但它没有设置默认选项值;这是我试图做的。在组件中,我使用setValue()方法来设置默认值。this.courseForm.controls['selectedTeacher'].setValue(this.course['Teacher'],{onlySelf: true});在模板中,我使用的是这样的选择: <select formControlName="selectedTeach...
onSubmit({ value, valid }: { value: any, valid: boolean }) { } } patchValue 我们先来介绍 patchValue() 方法,然后在介绍 setValue() 方法。使用 patchValue() 方法会比使用 setValue() 方法更好,为什么这么说呢?我们来看一下源码就知道答案了。 // angular2/packages/forms/src/model.ts export cla...
We have form definetion like this: reactiveForm: FormGroup; constructor(fb: FormBuilder) {this.extra =newFormControl('...', [ Validators.maxLength(100) ]);this.reactiveForm =fb.group({//title <-- formControlName="title"title: ['Title',//<-- Default value[ Validators.required, Validato...
Find the complete code of our demo application to set value to Datepicker usingmoment.js. student.component.ts import{Component,OnInit}from'@angular/core';import{FormBuilder,FormControl}from'@angular/forms';import{StudentService}from'./student.service';import*as_momentfrom'moment';import{Moment}fr...
import{Component,AfterViewInit,forwardRef,ChangeDetectionStrategy}from'@angular/core';import{Control}from'@angular/common';import{REACTIVE_FORM_DIRECTIVES,NG_VALUE_ACCESSOR,ControlValueAccessor}from'@angular/forms';import{ROUTER_DIRECTIVES,Router}from'@angular/router';import{Observable}from'rxjs/Observable'...
{ form: FormGroup; states = [ { name: 'Alabama', value: 'AL' }, { name: 'Alaska', value: 'AK' }, { name: 'Arizona', value: 'AZ' }, { name: 'Arkansas', value: 'AR' }, { name: 'California', value: 'CA' }, { name: 'Colorado', value: 'CO' }, { name: '...
从入坑到弃坑 - Angular 使用入门 Angular 从入坑到挖坑 - 组件食用指南 Angular 从入坑到挖坑 - 表单控件概览三、Knowledge Graph ?...通过使用 FormControl 控件的 value 属性,可以获得当前表单控件的一份数据值拷贝,通过 setValue 方法则可以更新...
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(We have to use a hack: [attr.value]="myForm.get('key').value) Environment angular version: 4.3.4 Browser: [ X ] Chrome (desktop) version 60.0.3112.78 [ X ] Firefox version 54.0 and probably the others as well. 👍 4 Toxicable commented Aug 16, 2017 • edited You should ...
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